I think that this is a [Prickly Cockle](https://beachguide.wales/shells/spiny.php) (Acanthocardia echinata) that I found on the beach a few years ago.
This model was created using [openMVG](https://github.com/openMVG/openMVG) and [openMVS](https://github.com/cdcseacave/openMVS) from 180 original photographs.